Funnel.



PATENTED SEPT. 10, 1907.

W. DAWSON.

FUNNEL.

APPLICATION FILED MAR. 1, 1906.

FIG. E.

. INVERTER WALLACE DAWSON.

WITNES 5E5 UNrrED STATES PATENT OFFICE.

WALLACE DAWSON, OF MONTREAL, QUEBEC, CANADA.

FUNNEL.

\ Specification of Letters Patent.

Patented Sept. 10, 1907 Application filed March 1,1906. Serial No. 308,626.

- strip of porous paper "into conicalform and insert it in the bowl of a funnel and to filter the liquid through said paper. .In usinga funnel with a plain or smooth surface, the paper fits snugly against the bowl and the liquid escapes only at the neck of the funnel. When a ribbed bowl is used, better results are produced at first but as the paper becomes saturated, it gradually clings to the surface of the bowl, filling the valleys and preventing the escape of the liquid except at the neck of the funnel. A great deal of time is often thus consumed in filtering a small quantity of liquid.

The object of my invention is to provide a funnel having means whereby the liquid can escape freely, at alltimes, from the sides, into the neck of the funnel, underneath the filtering paper;

The device consists essentially of a funnel having a bowl provided with a plurality of groups of narrow grooves or channels, the grooves of each group uniting into a single groove which continues into the neck of the funnel. The grooves are separated by comparatively wide plain surfaces, upon which thefiltering material rests, bridging'over said grooves without filling them and thus allowing the liquid to escape freely into the neck of the funnel.

In thedrawings which illustrate my invention:--' Figure 1 is a perspective view of the funnel. Fig. 2 is a plan view showing the interior of the funnel. Fig. 3 is a cross section of the neck on the line 7-7 of Fig. 1. I I

Referring to the parts, 1 represents the conical bowl of the funnel, and 2 the hollow neck. A plurality of narrow grooves or channels 3 are formed on the inner surface of the bowl, and converge towards the neck, as shown. The plain surfaces 4, between the grooves, are comparatively wide in order that the filtering material will have a large bearing surface and willnot tend to fill the grooves to prevent the flow of liquid.

As the circumference of the bowl decreases very rapidly towards'the neck, two or three consecutive grooves are converged at a point near the neck, as shown at 5, and continued as'a single channel, while the plain surfaces 4, between said consecutive grooves,

are converged to a point. This arrangement allows for the bearing surfaces on each side of the converged channel being continued\.into the neck without too great a reduction of width.

The grooves 3 are. continued into the neck of the funnel, as shown. The neck is also provided with vertical cxteriorgrooves 6 to allow for the escape of air from a jar or other receptacle.

The advantages of this invention will be obvious.

As the filtering paper rests on the bearing surfaces pro-" vided, thus bridging over the grooves, the liquid is filtered at all points and escapes freely from all sides into the neck of the funnel.

Having thus described my invention so that the same may be readily understood by,those skilled in the art .to which it appertains, what I claim and desire to secure by Letters Patent,.is

1. A funnel comprising a conical bowlconverging into a neck or tube, the inner surface of said bowl being plain and provided with groupsof narrow channels, each of said groups comprising two or more channels converging at the neck of the funnel into a single channel, substantially as described.

2. A funnel comprising a bowl converging into a neck or tube, said bowl being provided on its inner surface with a plurality of groups of narrow channels i'ormed below the surface of the bowl, each of said groups comprising two or more channels converging at the neck of the funnel into a single channel, substantially as described.

3. A funnel comprising a bowl converging into a neck or tube, the inner surface of said bowl. being plain and pro vided with groups of narrow grooves or channels, each of said groups comprising two or more consecutive channels converging at the neck of the funnelinto a single channel.

4. A funnel comprising a conical bowl converging into a neck or tube, said bowl being provided on its inner surface consisting of two or more channels converging at the neck of the funnel into a single channel extending into said neck.

In witness whereof I have hereunto set my hand in the 7 presence of two witnesses.

WALLACE DAWsoN.

Witnesses:

C. W. TAYLOR, W. G. Amrs'rnone. 

